development environment
Lnaguage : Golang ver.1.9.2
DB : mySQL
Framework : not decided (Maybe I'll use revel)
situation
I already have DB which has singular-name table ,like "user", "page". It can't be changed.
Now I'll develop new application using this DB.
I created simple application to connect this DB, and tried to auto migrate using gorm(https://github.com/jinzhu/gorm).
I defined some models, like "user" which is same as existing DB table name, and run auto-migrate just as it written in (http://jinzhu.me/gorm/database.html#connecting-to-a-database )
db.Set("gorm:table_options", "ENGINE=InnoDB").AutoMigrate(&User{})
Then, new table "users" was created.
Question
Can I create singular-name table, like "user" with auto-migrate or those things ?
Using gorm is not required, so I'll use another orm library if it works.
I hope anyone help me !
Implement function TableName on struct User to return a custom name for the table. The ORM uses this function to get the table name for all DB operations.
func (user *User) TableName() string {
return "user"
}
Refer docs here: http://jinzhu.me/gorm/models.html#table-name-is-the-pluralized-version-of-struct-name
You have set with db instance to use singular table, like this:
db.SingularTable(true)
Related
I would like to know if we can fetch a table model from MySql from Database, without defining all the properties.
I'm using Node.js ORM2
const orm = require('orm');
db.define('users', {
// donot want to specify all the properties/fields
});
Above users table has already been created in DB, so I just want to get that model and not create/specify all the properties in it.
We can do this with other ORM's like Objection.js - but can't change my current implementation.
Thanks in advance,
Unfortunately, you must define properties/fields while you are defining your Models. There aren't any other options.
I have transfered my project from MySQL to PostgreSQL and tried to drop the column as result of previous issue, because after I removed the problematic column from models.py and saved. error didn't even disappear. Integer error transferring from MySQL to PostgreSQL
Tried both with and without quotes.
ALTER TABLE "UserProfile" DROP COLUMN how_many_new_notifications;
Or:
ALTER TABLE UserProfile DROP COLUMN how_many_new_notifications;
Getting the following:
ERROR: relation "UserProfile" does not exist
Here's a model, if helps:
class UserProfile(models.Model):
user = models.OneToOneField(User)
how_many_new_notifications = models.IntegerField(null=True,default=0)
User.profile = property(lambda u: UserProfile.objects.get_or_create(user=u)[0])
I supposed it might have something to do with mixed-case but I have found no solution through all similar questions.
Yes, Postgresql is a case aware database but django is smart enough to know that. It converts all field and it generally converts the model name to a lower case table name. However the real problem here is that your model name will be prefixed by the app name. generally django table names are like:
<appname>_<modelname>
You can find out what exactly it is by:
from myapp.models import UserProfile
print (UserProfile._meta.db_table)
Obviously this needs to be typed into the django shell, which is invoked by ./manage.py shell the result of this print statement is what you should use in your query.
Client: DataGrip
Database engine: PostgreSQL
For me this worked opening a new console, because apparently from the IDE cache it was not recognizing the table I had created.
Steps to operate with the tables of a database:
Database (Left side panel of the IDE) >
Double Click on PostgreSQL - #localhost >
Double Click on the name of the database >
Right click on public schema >
New > Console
GL
I have a table in mysql database which consists of 3 columns: ID (int and primary key), name and surname (both are strings).
Now I created a model class in scala:
class Clients(
ID: Int,
NAME: String,
SURNAME: String
)
and in main function I have this code which connects me to db:
val db = Database.forConfig("scalaTest")
and my application.conf looks like this:
scalaTest = {
url = "jdbc:mysql://localhost/Scala1"
user = "root"
password = "mysql"
driver = com.mysql.jdbc.Driver
connectionPool = disabled
keepAliveConnection = true
}
And I am supposed to use slick framework to make connection between my scala program and database.
Now I am wondering if I created my model well, or should it look different? Also, I do not know how to connect my model class to database, I've seen few code samples (even the hello_slick_3.0 which is a demo of how to use slick for this purpose), but I did not understand those.
Any help would be appreciated.
You also need to define a table model. You can check a full fledged example here:
Gist for Slick 3.1.0 with scala.
The example is for H2(in memory database but slick abstracts the DB away. It's done exactly the same way for any underlying DB.
Hi there i have some sql tables and i want to convert these in a "Drupal Node Format" but i don't know how to do it. Does someone knows at least which tables i have to write in order to have a full node with all the keys etc. ?
I will give an example :
I have theses Objects :
Anime
field animeID
field animeName
Producer
field producerID
field producerName
AnimeProducers
field animeID
field producerID
I have used the CCK module and i had created in my drupal a new Content Type Anime and a new Data Type Producer that exist in an Anime object.
How can i insert all the data from my simple mysql db into drupal ?
Sorry for the long post , i would like to give you the chance to understand my problem
Thx in advance for your time to read my post
You can use either the Feeds module to import flat CSV files, or there is a module called Migrate that seems promising (albiet pretty intense). Both work on Drupal 6 or 7.
mmmmm.... i think you can export CVS from your sql database and then use
http://drupal.org/project/node_import
to import this cvs data to nodes.....mmmm i don know if there is another non-programmatically way
The main tables for node property data are node and node_revision, have a look at the columns in those and it should be fairly obvious what needs to go in those.
As far as fields go, their storage is predictable so you would be able automate an import (although I don't envy you having to write that!). If your field is called 'field_anime' it's data will live in two tables: field_data_field_anime and field_revision_field_anime which are keyed by the entity ID (in this case node ID), entity type (in the case 'node' itself) and bundle (in this case the name of your node type). You should keep both tables up to date to ensure the revision system functions correctly.
The simplest way to do it though is with PHP and the node API functions:
/* This is for a single node, obviously you'd want to loop through your custom SQL data here */
$node = new stdClass;
$node->type = 'my_type';
$node->title = 'Title';
node_object_prepare($node);
// Fields
$node->field_anime[LANGUAGE_NONE] = array(0 => array('value' => $value_for_field));
$node->field_producer[LANGUAGE_NONE] = array(0 => array('value' => $value_for_field));
// And so on...
// Finally save the node
node_save($node);
If you use this method Drupal will handle a lot of the messy stuff for you (for example updating the taxonomy_index table automatically when adding a taxonomy term field to a node)
I've inherited a Pylons app that uses SQLAlchemy. I know nothing about SQLAlchemy and very little about Pylons :)
I need to run some raw SQL from within the app. The SQLAlchemy currently seems to be working in the following way (example code):
import myapp.model as model
model.Session.query(model.KeyValue) # existing code
.join(model.Key)
.filter(model.Key.name == name)
).count() == 0, name
How do I get it to run raw SQL? I see that I need an execute() statement, but how exactly do I run it? The following both fail:
model.Session.execute('create table hello_world;')
model.Connection.execute("""
create table hello_world;
""")
What's the magic invocation? There's no reference to a Connection object in the existing code, and I'm not sure how to create one.
You can obtain connection that is used by Session by using its connection method:
connection = model.Session.connection()
Then you can issue your query:
connection.execute('create table hello_world;')
Note that in Pylons model.Session is not a sqlalchemy.orm.session.Session class. It's an instance of sqlalchemy.orm.scoping.ScopedSession. That's how it's created in model.meta module:
Session = scoped_session(sessionmaker())
My first impulse is to recommend trying the execute() method of an instance of Connection, instead of the execute() method of the class itself as your example code suggests that you're doing.
Are you working off of the Pylons Book examples ?